1. Department of Internal Medicine, University of Missouri, Columbia, MO 65211, U.S.A.
2. Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, MO 65211, U.S.A.
3. Department of Nutritional Sciences, University of Missouri, Columbia, MO 65211, U.S.A.
4. Dalton Cardiovascular Research Center, University of Missouri, Columbia, MO 65211, U.S.A.